- Marqibo(Registered Trademark) is vincristine encapsulated in sphingomyelin/cholesterol (SM/CHOL) liposomes, developed to increase the activity of vincristine. It has been shown to have activity in Phase 2 studies in adults. Previous investigation of Marqibo(Registered Trademark) in children is limited. A small phase 2 study was conducted with dosing of 2.0mg/m2 every 14 days. The agent appeared to be well tolerated and some activity was seen, although data were quite limited.